I would be upset if I was Hayward too. He put in a lot of time with the team that took away from other things he could have been doing. Once games roll around, everyone should at least get a chance to prove themselves. He didn't get a fair shake.
The biggest thing that bothers me is the whole Rudy Gay thing. If they really thought Rudy was a better fit for the national team why wasn't he invited originally over Hayward??? To me that is a sign that Hayward literally had a 0% chance of making the final cut. If injuries/withdraws don't improve your chances of making the team it means he wasn't considered a finalist from the beginning.
Also, Rudy Gay and Demarcus Cousins are both representing our country???!!!!!!! Is Coach K insane?
I could see all the guys getting cut being upset with the Rudy Gay and Plumlee additions. Gay being added was the death sentence for Hayward. After telling all select players they were not being considered for the World Cup team and then adding Plumlee wouldn't make me happy.
I think the USA team should have kept another shooter. Davis, Faried, Plumlee, Drummond and COusins seems like too many big guys in a game that requires outside shooting. I certainly don't think the USA is a lock to win the whole thing.